A model to describe the distribution of photosynthetically active radiation in forests using 3D point cloud data

A technology of photosynthetically active radiation and three-dimensional point cloud, which is applied in the directions of utilizing re-radiation, re-radiation of electromagnetic waves, climate sustainability, etc., can solve the problem of failure to take into account the angular distribution of real elements of the canopy, the inability to accurately describe the three-dimensional space-time distribution, and the lack of Consider other issues
CN112415537BActive Publication Date: 2022-07-12INST OF SOIL SCI CHINESE ACAD OF SCI
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Patent Information

Authority / Receiving Office
CN Β· China
Current Assignee / Owner
INST OF SOIL SCI CHINESE ACAD OF SCI
Publication Date
2022-07-12

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Abstract

The invention provides a model for depicting the distribution of photosynthetically active radiation (PAR) in a forest by using three-dimensional point cloud data, which belongs to the research field of vegetation remote sensing modeling. Aiming at the problem that the three-dimensional distribution of forest canopy PAR cannot be effectively estimated by using lidar data on a fine scale at present, the present invention proposes a forest PAR three-dimensional spatiotemporal distribution estimation model based on the forest ground lidar data obtained from multiple stations. The model separately considers direct solar and scattered PAR transport in the forest, while taking into account the effects of element angles. The model constructed by the invention can quantitatively describe the three-dimensional space-time distribution of PAR in the forest on a fine scale, with high precision, which is helpful for the research on the physiological process of the forest.
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Description

1. Technical field

[0001] The invention is a model for depicting the three-dimensional space-time distribution of forest photosynthetically active radiation on a fine scale through three-dimensional point cloud data. Estimating the three-dimensional distribution of forest photosynthetically active radiation at any time belongs to the research field of vegetation remote sensing modeling. 2. Background technology

[0002] Photosynthetically active radiation (PAR) refers to the part of solar radiation with a wavelength between 400-700 nm that can drive vegetation to carry out photosynthesis, and is an important environmental factor affecting vegetation photosynthesis and transpiration. The difference in PAR received by different positions of the forest canopy is obvious, and this difference changes with the change of the position of the sun. At the same time, the leaf photosynthetic speed has a nonlinear response to PAR. Therefore, the three-dimensional spatiotemporal distribut...

Claims

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